Sewer-pipe



(No Model.)

H. W. LIBBEY.

SEWER PIPE No. 465,936. Patented Decp29, 1891.

UNITED STATES PATENT OFFICE.

IIOSEA XV. LIBBEY, OF BOSTON, MASSACHUSETTS.

SEWER-PIPE.

SPECIFICATION forming part of Letters Patent No. 465,936, dated December29, 1891.

Application filed November 19, 1889. Serial No. 330,840- (No model.)

To all whom it may concern:

Be it known that I, HOSEA W. LIBBEY, a citizen of the United States,residing at Boston, in the county of Sufiolk and State of Massachusetts,have invented certain new and useful Improvements in Sewer-Pipes, ofwhich the following, taken in connection with the accompanying drawings,is a specification.

The object of my invention is to produce a sewer-pipe in which accesscan readily be had to the inside of the pipe for removing obstructions,or 'for other purposes, without breaking the pipes; and the inventionconsists in a sewer-pipe having an oblong or oval opening and a coverthat fits over the said opening, as hereinafter fully described, andpointed out in the claim.

Referring to the accompanying drawings, Figure 1 represents a plan ortop view of a sewer-pipe embodying my invention. Fig. 2 is a transversesection taken on line .2 a. Fig. 3 is a similar section with the coverremoved, and Fig. 4 is a cross-section of the cover.

A represents a sewer-pipe with a socket A at one end. At or about thecenter of the length of the pipe I form an oblong or oval opening B,which,when the pipe is laid, is at the top of the pipe A. A longitudinaldovetailed projection a is formed on each side of the opening B, and thecover 0 is formed with beveled edges on each side to fit into the saiddovetailed projections a, so that when the cover is in position on thepipe to cover the opening B it is held by'the said dovetailed projection17., and is not dependent upon the weight of. the earth above it to keepit in position. It will be seen that should any obstruction occur in asewer fitted with pipes constructed according to this invention when theearth has been removed from above the pipes the covers can readily betaken off, thereby rendering access to the interior of the sewer, sothat any obstruction can be removed and the cover replaced. I prefer toconstruct the sewer withall the pipes embodying my invention, as thenaccess can be had to the interior of the sewer at short intervals; but,if preferred, pipes thus constructed may be inserted only at desiredintervals in connection with ordinary sewer-pipes.

hat I claim as my invention is A sewer-pipe having an opening in itsside and two straight longitudinal ribs, one upon each side of theopening, and substantially parallel with each other, each of said ribshaving its inner edge overhanging the base, which is beyond the edge ofthe opening, and a rectangular cover conforming upon its interior withthe exterior surface of the pipe, and having its edges adapted to beslipped longitudinally under the overhanging portions of the ribs andclose the opening in the pipe, substantially as described.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 20th day of September, A.D. 1889.

' HOSEA V. LIBBEY.

WVitnesses:

OHAs. SrEERE, EDWIN PLANTA.

